Electromagnetic sparking plug.



E. KUHN.

'ELEGTROMAGN-ETIG SPARKING PLUG.

APPLICATION FILED JULY 17, 1909.

Patented 001.41910.

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THE Hemels PsrsRs co., wAsHmcrr/rl, u. c;

EMIL KUHN,

onzUarcH,

SWITZERLAND.

ELECTROMAGNETIC SPARKING PLUG.

To'all whom it may concern:

Be it known that I, EMIL KUHN, a citizen of the Swiss Confederation,residing at Kreuzstrasse, Stfa Ct., Zurich, Switzerland, have inventednew and useful Improvements in Electromagnetic Spar-king Plugs, of whichthe following is a specification.

This invention refers to an electro-niagnetic sparking plug with coilsarranged in a dust and gas tight casing and with a contact pinprojecting into the explosion chamber and situated on a shaft rotativelyarranged in the coil casing, which contact pin produces the sparking onthe rotation of the said shaft.

Now the novelty of this invention consists in the arrangement ofelectro-magnets on the shaft provided with the contact pin, whichcontact pins are connected up to the one pole of a source of current,and in this that pole pieces are firmly fitted in the casing which isconnected up to the other pole of the source of current, toward whichpolar pieces, on closing the circuit the electromagnets are movedagainst the action of a spring and thereby occasion the formation of aspark. In order securely to pack the casing from the explosion chamber,the shaft provided with the Contact pin is threaded and is arranged withthis threaded portion in a soap-stone bearing.

I will now describe my invention with reference to the accompanyingdrawing showing one form of construction and in which Ifigure 1. is alongitudinal section. Fig. 2. is a cross section in the line A-B ofFig. 1. Fig. 3. shows a detail.

Four polar pieces 3v are arranged in a casing 1 which is provided with ascrewthread 2 for screwing into the cylinder.

These four polar pieces together form a circular ring with inwardlyprojecting fianges 5.

The casing 1 is closed by a screw cap 6 to which is fitted an insulatedterminal 7. The terminal7 is provided with a bearing 8 for a pin 14 onwhich is arranged a socket 15 of insulating material. On the latter isarranged a socket 16 which is screwed together with a shaft 9 supportedin a soapstone bearing 10. On the outside of the casing the shaft 9 isprovided with a contact pin 11 which rests against a stop 17 of thesparking plug. The soap stone bearing 10 Specification of LettersPatent.

Application filed July 17, 1909.

Patented Oct. 4, 1910.

semi No. 508,254.

is provided with a fine screw thread as well as the portion of the shaft9 situated therein so that on rotating the shaft 9 it is moved somewhatin an axial direction. Two 4 pole armatures 1Q are arranged on the shaft9 and each of which is provided with a coil 13. The winding of the coilsis such that the armatures following each other in axial direction areof unlike poles, but in the rotary direction north and south polesalternate in pairs. The feeding of the current is effected from theterminal 7 through the spring 2O to the pivot 1st to which the wire ofthe coil is connected up. The armature is exposed to the action of aposition spring 21, the one end of which rests against the armature andthe other end of which rests against a polar piece. In order to avoidshort circuiting7 the one end of a spring is insulated by a glass plate22.

The stop 17 is preferably constructed as shown in F ig. 3. The stop 17is provided with a circular groove 2st with polygonal walls. This formof construction facilitates the formation of the spark; furthermore byturning the stop 17 a change of contact surfaces can always be easilyeffected.

I claim- 1. An electro-magnetic sparking plug, comprising a casing, ashaft arranged to turn within said casing, a plurality ofelectro-magnets arranged on said shaft, a plurality of stationary polarpieces arranged to line the interior of the said casing, each of thesaid polar pieces having inwardly eX- tending flanges each flange ofeach polar piece abutting against a flange of the neXt adjacent piece, acontact pin arranged on said shaft, a stop with which said contact pinmakes contact, and means for causing said contact pin to move towardsaid stop, substantially as described.

2. An electro -magnetic sparking pluo', comprising a casing, a shaftarranged to turn within said casing, a plurality of electro-magnetsarranged on said shaft, a plurality of stationary polar pieces arrangedto line the interior of the said casing, each of the said polar pieceshaving inwardly eX- tending flanges each flange of the polar piecesabutting againsta iange of the next adjacent piece, an insulatedterminal mounted in said casing, a pivot on which said shaft turns,electrical connections between said insulated terminal and said pivot, acontact pin arranged on said shaft, and a stop with lated terminal andsaid pivot, a soap-stone bearing for said shaft arranged in said casing,a contact pin arranged on said shaft, a stop mounted in said casing withwhich said pin makes Contact, and a spring passing around said shaft andhaving one of its ends secured to said flanges for moving said contactpin toward said stop, substantially as described.

4. In an electro-magnetic sparking plug, a casing, a shaft arranged toturn within said casing, means for causing the oscillation of the shaft,a soap-stone bearing for said shaft arranged in said easing, saidbearing being screw-threaded, and said shaft being provided with acorresponding screw-threaded portion, substantially as described.

5. An electro-magnetic sparking plug, comprising a casing, a shaftarranged to turn within said casing, a plurality of electro-magnetsarranged on said shaft, a plurality of stationary polar pieces arrangedwithin the casing, and a contact pin arranged on said shaft,substantially as described.

6. An electro-magnetic sparking plug, comprising a casing, cap piecesfor the upper and lower ends of said casing whereby a dust and gas tightcasing is obtained, a shaft arranged to turn within said easing, aplurality of electro-magnets arranged on said shaft, a plurality ofstationary polar pieces arranged Within the casing, a Contact pinarranged 0n said shaft, and a stop for engaging said Contact pin,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

EMIL KUHN.

Vitnesses:

CARL CUBLER, JOHANN BENZ.

